1. Institute of Microelectronics and Optoelectronics; Warsaw University of Technology; Koszykowa 75 00-662 Warsaw Poland
2. Centre de Recherche en Photonique; Université du Québec en Outaouais; 101 rue Saint-Jean-Bosco Gatineau Quebec J8X 3X7 Canada
3. National Institute of Telecommunications; Szachowa 1 04-894 Warsaw Poland
4. Faculty of Electronics; Telecommunications and Informatics; Gdansk University of Technology; Narutowicza 11/12 80-233 Gdansk Poland